JIS G3103 SB480M Pressure Vessel & Boiler Steel Plate
JIS G3103 SB480M Pressure Vessel & Boiler Steel Plate - Properties & Equivalents
Complete material data for JIS G3103 SB480M carbon steel plate for boilers and pressure vessels, including chemical composition, mechanical and physical properties, international equivalents, and application guidance.
Hot rolling, normalizing, stress relieving, cutting, welding, forming
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JIS G3103 SB480M Pressure Vessel & Boiler Steel Plate Introduction
JIS G3103 SB480M is a carbon steel plate for boilers and other pressure vessels, specified in the Japanese Industrial Standard JIS G3103. It is intended for intermediate-temperature service and offers a good combination of strength, weldability, and toughness. The 'M' in the designation indicates the material is supplied to a modified specification with closer control on certain elements or properties compared to the base SB480 grade.
Key characteristics:
- Minimum yield strength of 255 MPa (for thickness ≤50 mm)
- Tensile strength range of 480–620 MPa
- Good weldability due to controlled carbon equivalent
- Suitable for moderate temperature and pressure applications
SB480M is commonly used in the fabrication of boilers, steam drums, pressure vessels, and heat exchangers where reliable performance under pressure is required.
JIS G3103 SB480M Pressure Vessel & Boiler Steel Plate Chemical Composition
The chemical composition of SB480M is regulated by JIS G3103. The carbon content varies with plate thickness to maintain weldability and strength. Silicon and manganese levels are controlled to ensure proper deoxidation and mechanical properties. Phosphorus and sulfur are kept low to preserve ductility and toughness.
- Carbon content increases slightly for thicker plates to compensate for the reduced cooling rate during normalizing.
- Aluminum or other grain-refining elements may be added, but are not mandatory unless specified.
| Element | Standard Value (wt%) | Remarks |
|---|---|---|
| C | ≤0.28 (t≤50mm) / ≤0.30 (50| Depending on plate thickness | |
| Si | 0.15–0.30 (t≤50mm); 0.15–0.30 (50| For killed steel; provides deoxidation | |
| Mn | 0.85–1.20 | All thicknesses |
| P | ≤0.035 | Maximum |
| S | ≤0.040 | Maximum |
JIS G3103 SB480M Pressure Vessel & Boiler Steel Plate Thermal and Electrical Physical Properties
These physical properties are typical for carbon steel plates and are not part of the mandatory JIS G3103 standard. They are provided for design calculations and engineering reference. Actual values may vary slightly depending on the exact composition and heat treatment. All data are at room temperature unless otherwise noted.
| Property | Typical Value | Unit | Test Condition |
|---|---|---|---|
| Density (ρ) | 7.85 | g/cm³ | At 20°C |
| Elastic modulus (E) | 205 | GPa | Room temperature |
| Shear modulus (G) | 80 | GPa | Calculated from E and ν |
| Poisson's ratio (ν) | 0.3 | — | Room temperature, within elastic range |
| Thermal expansion coefficient (α) | 11.7 | ×10⁻⁶/K | 20–100°C |
| Thermal expansion coefficient (α) | 12.6 | ×10⁻⁶/K | 20–200°C |
| Thermal expansion coefficient (α) | 13.5 | ×10⁻⁶/K | 20–400°C |
| Thermal conductivity (λ) | 50 | W/(m·K) | At 20°C |
| Thermal conductivity (λ) | 45 | W/(m·K) | At 200°C |
| Specific heat capacity (cp) | 460 | J/(kg·K) | At 20°C |
| Electrical resistivity (ρe) | 0.15 | μΩ·m | At 20°C |
JIS G3103 SB480M Pressure Vessel & Boiler Steel Plate Mechanical Properties
Mechanical properties are determined at room temperature on test pieces taken in accordance with JIS G2201. Tensile and bend tests are mandatory; impact tests may be required by agreement. The yield strength, tensile strength, and elongation depend on plate thickness. Values below represent the minimum specified properties for plates in the normalized or hot-rolled condition.
- Yield strength is the lower yield point (ReH) or 0.2% proof strength (Rp0.2) for materials without a distinct yield point.
- Elongation is measured on JIS No. 5 test pieces for thicknesses up to 50 mm; for thicker plates, JIS No. 4 or 10 test pieces may be used.
| Property | Standard Requirement | Unit | Test Condition |
|---|---|---|---|
| Yield Strength (ReH/Rp0.2) | ≥255 | MPa | Plate thickness ≤50 mm, room temperature |
| Yield Strength (ReH/Rp0.2) | ≥235 | MPa | Plate thickness >50–100 mm |
| Yield Strength (ReH/Rp0.2) | ≥215 | MPa | Plate thickness >100–200 mm |
| Tensile Strength (Rm) | 480–620 | MPa | All thicknesses, room temperature |
| Elongation (A) | ≥19 | % | Plate thickness ≤16 mm, JIS No. 5 specimen |
| Elongation (A) | ≥21 | % | Plate thickness >16–40 mm, JIS No. 5 specimen |
| Elongation (A) | ≥24 | % | Plate thickness >40–100 mm, JIS No. 4 or 10 specimen |
| Elongation (A) | ≥23 | % | Plate thickness >100–200 mm, JIS No. 4 or 10 specimen |
| Bend Test (180°) | No cracks | — | Bend radius: 0.5a (t≤25mm), 1.0a (25 |
JIS G3103 SB480M Pressure Vessel & Boiler Steel Plate Direct Equivalents and Replaceable Grades
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A516 / ASME SA516 | Grade 70 | Equivalent strength and similar weldability; commonly used for pressure vessels. |
| International | ISO 2604-2:1975 | F47 | Comparable carbon steel plate for pressure purposes. |
JIS G3103 SB480M Pressure Vessel & Boiler Steel Plate Application Introduction
SB480M steel plate is engineered for moderate-temperature pressure equipment. Its balanced chemistry allows easy forming, welding, and post-weld heat treatment. The material is suitable for applications where safety and reliability under internal pressure are critical. Common uses include:
- Boiler drums and shells
- Pressure vessel bodies and heads
- Heat exchanger shells and channel covers
- Storage tanks for pressurized fluids
Fabricators often select SB480M when a cost-effective carbon steel with certified properties is required for compliance with pressure vessel codes.
Product Applications: Steam drums, Mud drums, Water tube boilers, High-pressure separators, Reactor vessels (low/medium temperature), Air receivers and compressed air tanks
Processed into products: Shell courses and cylinder sections, Dished heads (elliptical, torispherical), Flanges and reinforcement pads, Baffle plates and support rings, Nozzle reinforcements, Tube sheets for heat exchangers (where permitted)
Application industries: Power generation (thermal power plants), Oil & gas processing, Chemical and petrochemical plants, Fertilizer and pulp & paper industry, Industrial boiler manufacturing, Pressure vessel fabrication shops
JIS G3103 SB480M Pressure Vessel & Boiler Steel Plate Similar / Closely Related Materials
| Country/Region | Standard | Grade | Remarks |
|---|---|---|---|
| USA | ASTM A515 | Grade 70 | Similar strength range; for intermediate- and higher-temperature service. |
| Europe | EN 10028-2 | P295GH | Higher minimum yield strength (295 MPa) but overlapping tensile range; widely used for pressure vessels. |
| China | GB/T 713 | Q345R | Higher strength (yield ≥345 MPa); may require careful welding procedure adjustment. |
| Japan | JIS G3103 | SB450M | Lower strength version; suitable where lower tensile requirements are acceptable. |
Notes:
- The values provided are based on JIS G3103:2012 or the latest publicly available edition. Actual supply conditions may have tighter controls agreed upon between purchaser and manufacturer.
- For thicknesses above 200 mm, special agreement is required as the standard does not cover them.
- Impact testing (Charpy V-notch) is not mandatory unless specified in the purchase order; typical absorbed energy values at 0°C for normalized plates are in the range of 27–40 J.
- SB480M plates are typically supplied with mill test certificates according to EN 10204 type 3.1 or 3.2.
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